Is Starch A Polymer? | Detailed Explanation

This article is talking about an interesting question “Is starch a polymer?”. We will find out the answer systematically to help you better understand starch, this common stuff in daily life.

What is a polymer?

To get to know “Is starch a polymer?”, we may need to figure out what polymer is first. It is fundamental for us to discuss if starch belongs to the category of polymer.

The term polymer derives from two Greek words "poly" and “meros”. Poly means “many” and meros means "parts." Combining the two words, you will get "many parts." How to understand polymer’s conception in a simple way? It’s to connect lots of smaller molecules into a long chain, then generate a larger molecule. That is a polymer.

Polymers can exist naturally or be synthetically manufactured by humans. There are two well-known instances of naturally occurring types: DNA and RNA. Some other naturally existing polymers that we are familiar includes silk, wool, hair, nails, feathers, cellulose, and proteins.

Plastic is the most ordinary artificially produced polymer, able to be molded into various shapes with numerous household and industrial applications. 

You may have a basic understanding about polymer now, let’s proceed to “starch”.

What is starch?

Starch is a macromolecule carbohydrate, a polysaccharide composed of a single type of sugar unit. Its fundamental building block is α-D-glucose. Glucose molecules are linked through glycosidic bonds after the removal of water molecules, forming the covalent polymer which is known as starch molecules.

Is Starch a polymer?

Now let’s look back to the question that if starch is a polymer or not, we can get the conclusion confidently: yes! Starch is a kind of polymer. 

Starch is a macromolecule carbohydrate polymerized by a single type of sugar unit, which conforms with the polymer’s definition: connecting many smaller molecules to form a larger molecule.

How is Starch extracted?

Starch is a primary component of the human diet, meanwhile, it serves as a crucial industrial resource. Currently, starch is mainly synthesized through photosynthesis in crops by utilizing solar energy, carbon dioxide, and water. It is extracted mainly from sources like corn, wheat, cassava, potatoes, rice, and other plants. 

The starch yield varies significantly across these sources. For instance, 1 kg of corn yields around 0.625 kg of corn starch, while 1 kg of potatoes yields about 0.20 kg of potato starch.

Starch is obtained from crop materials through wet processing, where plant proteins, fibers, and germs are removed, with starch slurry left. The slurry is dried to get natural starch or processed using physical, chemical, or enzymatic methods to create modified starch or starch sweeteners.

In daily life, if you want to extract starch, you can follow these steps: soaking, grinding, re-soaking, milling, sieving, separation, washing, dehydration, refining, extraction, and drying.

What are the applications of starch?

Starch plays a crucial role in many industries like food, chemical, packaging, and so on. As each type has distinct properties, starch is available to be applied in different industries. So, starch, the “ordinary-looking” polymer, starch, is a darling actually for many manufacturers.

Let’s see how starch exerts its special influences in various industries:

1. Food industry 

Both natural and modified starches are prominently employed in the production of edibles. It is widely used in flavor-enhancing candy, confectionery, and sauces. Modified starches can be found in most frozen food, all convenience food contains such components. 

2. Packaging 

The versatile binding properties of modified starches also make them important adhesives in paper and corrugated packaging. 

3. Pharmaceuticals and chemistry

Starch's fusion and solubility make it suitable for tablet and capsule formulations. Furthermore, starch stands as one of the few natural ingredients suitable for human consumption, gaining the favor of manufacturers with cost-effectiveness, minimal processing, and easy availability.

Starch finds application in chemical industries, aiding the production of amino acids, organic acids, enzymes, and yeast. 

4. Feedstuff

In the realm of animal feed, a portion of starch enters the mix, while most are byproducts from other processes. 

5. Other applications of starch

Beyond those fields mentioned above, starch's utility extends to textiles, adhesives, bioplastics, detergent manufacturing, and even 3D printing inks.

Conclusion: Based on the above explanation, from the conceptions of the polymer and starch, we can give a firm answer to the question “Is starch a polymer?” now: yes, starch is a polymer! 

Furthermore, we also introduce the process to extract starch and the applications of starch in various industries such as food, packaging, pharmaceuticals and chemistry, animal feed, textiles, adhesives, bioplastics, detergent manufacturing, and even 3D printing inks, which will be helpful for you to learn about starch better.